In the given scenario, if the population of gray wolf would decrease, The cottonwood population would decrease. The correct option is D.
What is a food web?
A food web is made up of all the food chains in one ecosystem. Every life form in an ecosystem is a part of several food chains.
In the given scenario, the grey wolf is eating the animals that feeds on cottonwood. It the wolf population decreases, it will result in the population of cottonwood eating animals, which ultimately causes a decrease in cottonwood population.
Thus, the correct option is D.
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